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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab0021d68f0ffc540ddecb5b58e741a0de248a29dc1acbbc8a4d7b2cf5c0f31' 
  AND token = 'Et4q9F6bltZcYAkwifINxvVx+lgiD/IsNQ997KLKjbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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