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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbda8f6da222085a9dca187ad2d5217192b14e812c13adf30c7c65f6a1237363' 
  AND token = 'YZeuihyDboj9ehSr6GV7klDGoX69u27WtSnOMAlStkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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