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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd5d3d2aca5854cbf57ffeb236055ca88fc5de45fe7b36b4feb3f649fbe5478' 
  AND token = 'BLq7gMoRjeMe+GHFJkxQok4ybmY5fMb1sqQ82tdx5k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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