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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7926060c13f474564461797009ace63a2fab75143e10beab2c5d6e096d46b91d' 
  AND token = 'KDbP7PSd8Oz5/rRn1S1sQ4p2NM4uz1T9hEQtc19AD4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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