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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db48d2c7aa0bdca313ae0a34532a5e8f4321ccc61fdc22cca6ef61d110fc3b0f' 
  AND token = 'bHjOJ9xYlUiRWQLZmz2W7DNW0qTJqt15OBuEtFj9Z5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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