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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d1917ebf934a92d4e3e9d40eae35db1aacce2fe7e16e5d12e0df9ec605ae13' 
  AND token = 'p2rG/s8T5TRW9WLcdi1phrWq+t97ggSgWpGg1J5igAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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