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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147f0e3b235cefab153c11104e32b17705662de92be1d6560b774dd7356d44dd' 
  AND token = 'N+Q531f+ocCiKUR7ogO5iKCK6mVn5B5SNNvC4z73hIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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