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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45a75115c3a55aa10b251d56f6373f88e5c2668d853ead45a0aec0ea65ebd0b7' 
  AND token = 'Hr75Z0VHkEi1mfRsH9G30nXvAdMXhNnqbJKypFCDeU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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