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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5277cf83569c887a1156a563c0d3d6915218730a530d120de87a455c11fa3a74' 
  AND token = '0U3vQ2kUghf0nCKZsVnV3yfYPYazo08Nag0JuGjIWHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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