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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aec6f7d2c3ae3bf56a08dc40b0d8c3b6a2cec8cc28ec5c3f19d112838347f31' 
  AND token = 'sjJKFYg3ELDoOX96CmTTI0i3g5A5O6Evxndi4opCDmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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