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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547169ef3e93c10fafacb362905c1e04792e5ca52bcbd9e6f9ece1602ac7e18d' 
  AND token = 'qAQv1hPl5qM4OC4mltOOXLn2CLaJ1xCz1D5zK1h1oDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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