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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf19b76f5f816318500bc38bfca9dc16493f000360fc0861ab7c5d1eacdbcf6' 
  AND token = 'B5HKA7EyimvSNrTzcQGEd/9q5an2iOP25nFjlhNsCf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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