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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0eda0f9b6c203b78e56e24bdcb98772ed7c13d04cef0daa6e31b3417aad4daf' 
  AND token = '+9LBaC05OOblsSpp/lU2yNslxUBWYC5YEzWF1Dr1b4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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