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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa6821e72fff58b50f340744abdf97f147ba193d7cfe3538c0777cfbfafc3bf' 
  AND token = 'J5CtfZ2MKye3EJWx9/FTdhrP/G3b8IJHjd/VMJmCimc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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