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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e071239f5a614eab1e562031edcd4d5fcb6aed44bae326cb205beccc29383b39' 
  AND token = '/1trfKYCONq5VqR8h9AMJpKl1n8CIYcT0rXv+WJ8C2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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