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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1fda567e93340a6e9d839ea64804901bbbff2d1bf36a5a413302fd211c0e6e' 
  AND token = '0Ji77Uu3gK1FWp6YgxKbwseBzXaFFiJvSulslKNftdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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