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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7eddbd9d16dbb5581243575c0d8298b298a96b42ca9b87283fe93937d983f5' 
  AND token = 'LTewojYpHAuNwfYVHJFniEjeV3T8xqTwIMnqMT8aK3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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