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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '747f42db8ca9d5be309d66edcf49634ee6d56d6d8cccda9997aef13ff1949289' 
  AND token = 'MP5GLEVEedeFs9TruAjlvbf5SBxr7LVNQtu2T/0WH9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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