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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5d6ea4ec99eb9000ea6db7db39df169d5a315fa7300d590a999449e710a372' 
  AND token = '/SelXGBvS+LVU0ksxR5O2fSqO9J2/HaXAxOlGG17RUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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