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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faed365e719d8b46cb6730feb83cff714c9a053f63a46cfd37fdc8719aadf845' 
  AND token = 'FBzbj8BMVRfbERlRFRdwafyB7njo36yleQL8HQCq/l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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