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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce702e081591b25f068c3e27cfaf0c1198fe7d7f14c455cafce6ded53e44e1f' 
  AND token = 'qbzwSzRmij5FZA3B60KLOro6ApOpS3RPfIg5pcOTrEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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