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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b46a14cc78af97e2a2ae4a71d224edfbfc734eab14fdfdf3ea861426552f88d' 
  AND token = '5fthYU/X04xlvBM2zMAv37HqFQ2Lkbjh5nwm2b9tAjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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