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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a18830242c7e39334dc1ad7cf1148c137f91cb818e26d71dadb1b0f3f722ba' 
  AND token = 'QxDecU1yaAGhKMOOaVTZVdP5uRIjsEja5DfF6cinJUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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