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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178282bd630b3416facfd1142a89e47317396f75b9a5b2ec25451b02da4cea20' 
  AND token = '3cYQslR/6Rw9a/ElhxsZgnufMagkHQphcZLk9+Y/4r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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