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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e962a5d548d81440d1f0f465f35a742af8917386cda82668d8871b24bd7caaab' 
  AND token = 'nWEp1iVpSnCTLcvD+xuSY2SuH02LXpdUnePlXuNJ4B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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