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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74b5f57df7b65f93c3730ad60c7b058687b49cf0b74702bd13bb3f101cb9d3a' 
  AND token = 'g9McN6xe/c1eKoaURYZ5ZYY4PpH7uBbAB+ePPqN9K58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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