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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c877b9348ef3088351f5f64f79d3c4a37274779c0153fef8aaaa1ff154ee6649' 
  AND token = 'V9eon5mowbSzZGGT5smlXGZt/ct8xYnfKrPUKW5ZQWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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