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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34a1a6995095da614c0c81c03719c6a4b9b8464efb353416b5b74213879a9da' 
  AND token = 'EqIUnIupcX1IhtOh+6T0Eru3JEKnYSskw0GwEhSAXXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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