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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7a0a1582954c456cdd94b9c36953b0c9cc871dfec60b1cedb1cc75819828cf' 
  AND token = '3w7y/VaNNpS5jJlD0lwCkDSsfmuBeBiB1W22U6aGqIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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