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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e186611b9e49b2924c1b2e587ba325aff1436dc28fd085825ad01d5bdc13ab' 
  AND token = 'pRGNsbS7Zh86Or3S4HpjRARcHmtLw3+88mzrLpcWbZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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