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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95fbc7bdfc8bfd6b811514b66fca0cdc5c7f1ec74529250b5d6dceace870a33' 
  AND token = 'Si2tXQNz+4ikPoYLXJ3KKvE33LvCLTfomWNe6YUzhV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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