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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9df5024bb312c6b4c8540ecb40ed330a077a03fea82119c58d4db314bd70a6' 
  AND token = 'pCOpmPIozF60h413c4RgOsbqCgRcfvpnyIKCyXMAl7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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