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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a094f657a7fcbabc4767458f32eefcc358aa85c28ca305998fb6c0950e8d1f' 
  AND token = '5nL8nW5l04CugmivjOZCz8oBr7LiTZh5gySn27TICBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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