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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d4e84ffa0ba42eebb5cabc736cb6c8b360bee63f8698b7fb3fe4df6a4229b9' 
  AND token = 'WDDiH7laQXBgtcFSSt1VvmcTaTrdsco/UqHL6pTZFBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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