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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d15f154b0cbe455dfe1ef04c64084c0821fb3ff2e50445ac537d3fdf6efca5' 
  AND token = 'QIrn3eQiIljP7pLFKhQoetLGEdJYEFHc/yaI7E/NZik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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