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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9ae11e28847f2ae27de1ddcec8fd1261ee53680c33fa5e11d9ab8e36028668' 
  AND token = 'ha3YHW5s0Wn262U7U1c8j58kG5Q1xlVU9mKrdprcA00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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