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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bded6a3f0b92a6a227fb12c33756f3d8b678a27985fa7e2ded19d42e20739e1' 
  AND token = 'V8uIFMFhWHWdsEMbzA45bqMl7YOun0iNG23OZEjqSVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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