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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de948c49a0f46155a5e5a4b7356db76d254242a47efa15b9b598a0e3ed94d55' 
  AND token = '99UoPxS+7gQkbgRNBCh3Tc0tMznZL0s2KORMpFz6Hrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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