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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8185d7b6359ebaabb1302f53fe1446a40853a458d0732044280d6db57f0c4ad' 
  AND token = 'ONOS9TDWNjh47vwqfaAul6lGuSmW4yWqbkKv7X8OHO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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