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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab66b65aebeee2e47d61713e4a7ad8969c73c5720de2481ab69279d900c95eab' 
  AND token = 'bU2SfveOVc5fIJ7MhP7p5y1ONaWVQ/JZlWnwZUvgG5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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