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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1f5609ffe919e330e06e675b38c5ac95aefd0f746d786969da145a0a9c544e' 
  AND token = 'B1UoShmL67hRr16F/GEECCFbWbRb9nprkyx+yiOQntA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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