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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd0c9cfc15155605e04500a0314d7ecd221d6c7e51ff0bba1d87b70bcab4232' 
  AND token = '4Dwj/NR8JPloO+zpC1GHvwh6BHPrsTfmwrvQAlIrT38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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