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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b819acd80bbd1e467df7822d22126a96a38d3388c0086de8682ceae9ef99f95' 
  AND token = 'VNicMNON2OziC+32oO5QGg4p5EYfbC2KXvJlip3SDSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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