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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd650741bc96827eff6900d2d0b279c0917475fc792e2a59faf598772e33abc6e' 
  AND token = 'TlVArXV6jAgzuYrdeakQv/eB9f9D9qWGPrr0Yxo6orc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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