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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a2ada436dc8c0d1eb32dcb61c2cd87b7c8845a0ece6d25237c732e8acbd51c' 
  AND token = 'a35+iLZIC4HnCr0uXlmVJiz3mIwBZYxGK/72J17HPmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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