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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93807db2c197e2928d9d7855fc0c3afef293d5903989640632fdd24f6fb1d10' 
  AND token = 'LQ020A7lq+qwE7MVfex0A7xvsmaWaTuuPfiNtk9l7FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}