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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1703521ad05ad572680f5d62f8b85d87e4f065ec02f831ed54dddc4e8df7aae' 
  AND token = '9Hpi5Yw1ARPyR4v/IG+sk33tyiWr9JRBslb/BkasT1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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