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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b18a6dc42b6a1f2c89736cae0d529eb2d6c7f37060ff4da2f42abf1fe73ffb' 
  AND token = 'YgNFTNkXzzaXx8S3ZV/6Ui3JDVEbo1NkNBAL1lQ8HdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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