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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c61fbd3f3e38d26c5f207b749122ed6ce0acaab5032778922eb43dcdddcbfcf' 
  AND token = 'VQdI07BLn5VMIpdGpBl2GvDCcevT/P1X9ptkEvTZO+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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