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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f26df0c80d78239e8caea14036a5731ee0fb89ec8466d7a8f8d0144ada07c6' 
  AND token = 'znV23tPAaJoKBl0+8xKdY7xQ/XIdC8oMeb7BgEfWNwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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