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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31bd8aa8e0c12a9ea57b34c40a464b425484d7232b984c105064b4ed59819d3b' 
  AND token = '9QI4sTLiVVhuD8oAH36ujmovsGNYeecytEfctDHs1h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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