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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531fc91ecdff5e207d73e78c9138f5206b36f48b69bef27848cfa1e41acb1f87' 
  AND token = '1smoDqrJAkST300wevMmJZlOhzlzLImq37nBOFolSMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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