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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79083c68b7927f3e6a5f4612e45fdab10dc13a1f6d21e2a689bbc3ac2af4893c' 
  AND token = 'yy5h55ccwsAWYspspO6KW9shitcQn5RWPPTpnaSG6dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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