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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792e69c4737a275a14d01648bb36fba8d14d2bad16d7f9c23c793b47c8db9bab' 
  AND token = 'wvSoLHEslEkdfUrEA2Plz+pDoNf4/RNrFJxui0Whmks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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