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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97e1572a6f48bcb7788da48b1ad2faa2780019ffb78e8b0856b1444791ebd89' 
  AND token = 'ynjISy+R8evNzd0cH4msVfZ5BmHZUZr/Fh4ykKyMcY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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