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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d6ff57c9d1aefa47e4df93db5047a3e85a28f2c1aa6e267009586174fa7b36' 
  AND token = 'K9oQn2gzJc7CXxNRiGiDAKxii7xqLmly7NAULxgHM24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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