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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776566f87c56ae0f469b15a4d01474023358efc60f26e4ae07238f7606196f43' 
  AND token = 'GoZzNifqXYPpKup9mWMR2QwNUmHLHP6KqrIeehtUopc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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