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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '518cf00c8032a60b850f1681f3987e212158556f609eeab3628369255b2c2e69' 
  AND token = 'j/49i5dFhEL3gtTSz9uPUvZC43WVzdSjk9dIqqaOSF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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