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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874ba6f1f2a202e4d1b938ca5cfdbe61fee70e086983cb7b6232e0eb7effe18d' 
  AND token = 'rVgD6W2iRMKprEYOpakFyVlYKQ8PeTcCRUR+HUB7TvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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