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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16e3ca86e9570dcc2ae5eb8cc352d3625a6590cd727c87da94b78877424cd03' 
  AND token = 'oeJLQzarUOUn6hDe8/PIJQ9rsTHq3WP1XaGy/jlKbsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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