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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2da2a33fd76c387e0bf3bf0d79d58f35c22c25d294ae76f27fd07f649353a1' 
  AND token = 'Um/Xx8vgRwrzr/Had8ww3tcupSrmjHxPHEKyvWK67+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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