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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39eed7f2400c04a4a295ba9cef4f6089064e3a98ec212106762747881878c253' 
  AND token = 'HLQuMDoDP2SYCIxiruk7D541zdxeIU1M+b+GKbb8M30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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