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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c982e2f549fe870915e6a4f4dbb9aa441ca329ac29d10ae324e5e25e7bdd877a' 
  AND token = '5Wkjtm2Z7JooMTU2hpQ0pwgmVEau7BDeiBWxNYPD3L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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